I wrote a script to do this easily
using System.IO;
using UnityEditor;
using UnityEngine;
public class AnimationExtractor: MonoBehaviour
{
[MenuItem("Assets/Extract Animation")]
private static void ExtractAnimation()
{
foreach (var obj in Selection.objects)
{
var fbx = AssetDatabase.GetAssetPath(obj);
var directory = Path.GetDirectoryName(fbx);
CreateAnim(fbx, directory);
}
}
static void CreateAnim(string fbx, string target)
{
var fileName = Path.GetFileNameWithoutExtension(fbx);
var filePath = $"{target}/{fileName}.anim";
AnimationClip src = AssetDatabase.LoadAssetAtPath<AnimationClip>(fbx);
AnimationClip temp = new AnimationClip();
EditorUtility.CopySerialized(src, temp);
AssetDatabase.CreateAsset(temp, filePath);
AssetDatabase.SaveAssets();
}
}